Add no trailing slash to prefix in advance. This is already managed inside the subrouter constructor.
IE<9 don't support accessing a string as an array. Switched to string charAt and substr method.
IE<9 will reloop over new index in a hash. As so, create a temporary routes hash, and completly replace 	his.routes with it after the loop have run
Merge pull request #6 from SBoudrias/wip

Fix bugs with IE<9